var msg = '(๐•̆ ·̭ •̆๐)  不要离开我啊！';
var t1, t2, t3 = document.title;

typeof document.hidden != "undefined" ? (t1 = "hidden", t2 = "visibilitychange") : typeof document.mozHidden !=
"undefined" ? (t1 = "mozHidden", t2 = "mozvisibilitychange") : typeof document.webkitHidden != "undefined" && (t1 =
    "webkitHidden", t2 = "webkitvisibilitychange"), (typeof document.addEventListener != "undefined" ||
    typeof document[t1] != "undefined") && document.addEventListener(t2, () => {
  document.title = document[t1] ? msg : t3;
}, false)
